Deep battle is like a big game of hide-and-seek but with weapons. Imagine there are two teams of soldiers playing. One team hides in a big forest, while the other team tries to find them and defeat them.
But in deep battle, it's not just about finding the enemy team. The attacking team also needs to find and destroy the enemy's important resources and communication lines, making it harder for the enemy to fight back.
It's like taking away the other team's ball (or resources) so they can't keep playing the game.
Deep battle happens when the attacking team goes deep into the enemy's territory to do all of these things. They try to get as close to the enemy's base as possible, and they might have to fight many battles along the way.
It's important to have a good plan for deep battle because it's a lot more dangerous than regular battles. But if the attacking team is successful, they can weaken the enemy's ability to fight, making it easier to win the overall war.